Information recording carrier and information reproducing apparatus for the same

• US 20100110869A1
• Filed: 01/05/2010
• Published: 05/06/2010
• Est. Priority Date: 09/26/2001
• Status: Abandoned Application

• Current Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Original Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Inventors: KONDO, Tetsuya
• Application Number:
  US12/654,817
• Publication Number:
  US 20100110869A1
• Time in Patent Office: Days
• US Class Current: 369/275.400
• CPC Class Codes: G11B 2220/216 Rewritable discs
• CPC Class Codes: G11B 2220/235 Multilayer discs, i.e. multiple recording layers accessed from the same side
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 2220/2575 DVD-RAMs
• CPC Class Codes: G11B 27/24 by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
• CPC Class Codes: G11B 7/0033 with cards or other card-like flat carriers, e.g. flat sheets of optical film
• CPC Class Codes: G11B 7/00454 involving phase-change effects
• CPC Class Codes: G11B 7/0053 Reproducing non-user data, e.g. wobbled address, prepits, BCA
• CPC Class Codes: G11B 7/007 Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
• CPC Class Codes: G11B 7/131 Arrangement of detectors in a multiple array
• CPC Class Codes: G11B 7/24079 Width or depth G11B7/24076 takes precedence
• CPC Class Codes: G11B 7/24082 Meandering

Abstract

Plural grooves or lands formed in an information recording carrier include at least a wobbling region and data is recorded wobblingly in this wobbling region by phase shift modulation while recorded digitally with a single or multiple waves as a channel bit.

Claims

1-10. -10. (canceled)

11. An information recording carrier having minute pattern including plural grooves formed to be substantially in parallel and adjacent each other, comprising:

a supporting body having the minute pattern;

a recording layer formed 6 on the minute pattern formed on the supporting body; and

a light transmission layer formed on the recording layer,

wherein the minute pattern is formed under a relation of P<

λ

/NA, where P represents a distance between centers of adjacent grooves, λ

represents a wavelength of a laser beam, and NA represents a numerical aperture of an objective lens,

wherein the plural grooves include at least a wobbling region,

wherein said wobbling region records, as wobble, data modulated by phase shift modulation,

wherein the thickness of light transmission layer is from 0.02 to 0.12 mm,

wherein the laser beam has a wavelength λ

of from 350 nm to 450 nm and is projected onto said recording layer through said light transmission layer,

wherein the objective lens has a numerical aperture NA of from 0.85 to 0.9, and

wherein the data modulated by phase shift modulation consists of address information and auxiliary information.

12. The information recording carrier according to claim 11, wherein the phase shift modulation portion is composed of plural phase portions and a minimum phase difference among the plural phase portions is set within minimum phase difference among the plural phase portions is set within from π

/8 to π

.

13. The information recording carrier according to claim 11, wherein the phase shift modulation portion is composed of two phase portions and the minimum phase difference between the two phase portions is π

.

14. An information reproducing apparatus for reproducing information recorded in the information recording carrier as claimed in claim 11, the apparatus comprising:

a light emitting element configured to emit laser beam at least having said wavelength λ

;

an objective lens having said numerical aperture NA; and

a pick-up having a photo detector,

wherein said objective lens is arranged so as to oppose said light transmission layer.

15. The information reproducing apparatus according to claim 14, further comprising a demodulator demodulating reproduced signal outputted from said pick-up.

16. The information reproducing apparatus according to claim 14, wherein the phase shift modulation portion is composed of plural phase portions and a minimum phase difference among the plural phase portions is set within from π

/8 to π

.

17. The information reproducing apparatus according to claim 14, wherein the phase shift modulation portion is composed of two phase portions and the minimum phase difference between the two phase portions is π

.

18. An information recording carrier having minute pattern including plural grooves formed to be substantially in parallel and adjacent each other, comprising:

a supporting body having the minute pattern;

a recording layer formed on the minute pattern formed on the supporting body; and

a light transmission layer formed on the recording layer,

wherein the minute pattern is formed under a relation of P<

λ

/NA, where P represents a distance between centers of adjacent grooves, λ

represents a wavelength of a laser beam, and NA represents a numerical aperture of an objective lens,

wherein the plural grooves include at least a wobbling region,

wherein said wobbling region records, as wobble, data modulated by phase shift modulation,

wherein the thickness of light transmission layer is from 0.02 to 0.12 mm,

wherein the laser beam has a wavelength λ

of from 350 nm to 450 nm and is projected onto said recording layer through said light transmission layer,

wherein the objective lens has a numerical aperture NA of from 0.85 to 0.9, and

wherein a linear groove is formed adjacent to a groove including said wobbling region.

19. An information reproducing apparatus for reproducing information recorded in the information recording carrier as claimed in claim 18, the apparatus comprising:

a light emitting element configured to emit laser beam at least having said wavelength λ

;

an objective lens having said numerical aperture NA; and

a pick-up having a photo detector,

wherein said objective lens is arranged so as to oppose said light transmission layer.